Plate 1G. 



Fig. 1. Ctenopleiira a^tropcctinides ; fourth inferomarginal and 2 adjacent 

 adambulacral plates of type, X4. Id. Same; a paxilla from base of 

 ray, X8. 1?>. Same; side view of paxilla. I'adial lino of ray, XS. 

 If. Same; abactinal plates, fmm inner side; /• — /•, radial series of 

 plates of ray, XS. P. 91. 



2. Ctenophorastcr diploctcnius ; terminal plate, denuded, XS. 2a. Same; 



abactinal plates, from inner side ; r- — r, radial series of plates, base 

 of ray, XS. 2/j. Same; ninth and tenth adaml)ulacral plates and 

 adjacent actinal intermediate plates, XS. 2c. Same; tip of a lateral 

 inferomarginal spine, much enlarged. 2(1. Same ; abactinal paxilla, 

 X16. 2e. Same; eighth inferomarginal plate showing the second comb 

 of lateral spines (1) and a single spine (2) of the outer lateral se- 

 ries; the actinal spines are .shown, and the circular scars of the 

 accessory spinules, X6.5. P. 9-1. 



3. 7*.s'//«.s'^cr (fotoi ; eighth and ninth adambulacral plates of type. 3a. 



Same; abactinal paxillae from base of ray, that to left being one of a 

 radial series. X16. 36. Same; terminal plate, XS. P. 100. 



4. I'fiildstcr robust us : abactinal paxillae, X16. 4«. Same; terminal plate, 



denuded. P. 103. 



563 



